Some Concerns With Roundup Ready Spring Canola for Italian Ryegrass Control

Abstract

Spring canola acreage in the Inland Pacific Northwest increased from just over 52,00 acres in 2017 to just under 191,000 acres in 2023. A large percentage of the spring canola acreage is planted to glyphosate-resistant (Roundup Ready) varieties. And while glyphosate has provided excellent control of Italian ryegrass in glyphosate-resistant spring canola, herbicide resistance can develop when a single site of action is used repeatedly over time. Thus, over the past two years (2022 and 2023), field studies were conducted to evaluate the benefits of using herbicides with different sites of action, both with and without glyphosate, for the control of Italian ryegrass in glyphosate-resistant spring canola. Earn 0.5 CEUs in Integrated Pest Management by reading this article and taking the quiz at https://web.sciencesocieties.org/Learning-Center/Courses.